Appeal No. 96-0998
Application No. 08/180,288
sufficient to overcome the repelling force, the moveable magnet
moves through the induction coil toward the fixed magnet. In
this way, a voltage is induced in the coil. The voltage may be
transmitted over a pair of electrical leads to an air bag
actuation means.
The prior art
Warner discloses a vibration sensor that can be modified for
the measurement of “jerk” (rate of change of acceleration).
Column 5, lines 33-35. The sensor has fixed magnets and a
moveable magnet 10 held apart by the repelling force of like
poles facing each other. Induction coils 13 and 14 are wrapped
around a passage 11 containing the magnets. When the sensor
experiences motion, the moveable magnet 10 moves inside an
induction coil toward a fixed magnet. In this way, voltages are
induced in the coils. The voltages may be transmitted over a
pair of electrical leads 15 from each coil. Column 2, lines 18-
29; Figure 1. Any movement of magnet 10 relative to the coils 13
and 14 will generate a voltage proportional to the velocity of
the movement. Column 3, lines 6-25. When modifying the device
to measure jerk, the motion of moveable magnet 10 would be
damped. Column 5, lines 35-37.
Tognola discloses a motion sensor similar to Warner’s.
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